/* ==========================================================================
   VAIZO Editorial — Print & Web Stylesheet for V/ENTER WEB Handbook
   v1.0 — 2026-05-09
   ========================================================================== */

/* ----- 1. Design tokens ----- */
:root {
  /* Colors (white & black only, with subtle gold accent) */
  --ink-black: #0a0a0a;
  --ink-charcoal: #1c1c1c;
  --ink-graphite: #3a3a3a;
  --ink-grey: #6b6b6b;
  --ink-soft: #8a8a8a;

  --paper-off-white: #f5f3ee;
  --paper-cream: #faf7f2;
  --paper-pure: #ffffff;

  --rule-hairline: rgba(10, 10, 10, 0.12);
  --rule-strong: rgba(10, 10, 10, 0.4);

  --accent-gold: #b89b6a;

  /* Typography */
  --font-sans-en: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-sans-jp: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-serif-en: "Cormorant Garamond", "Playfair Display", Georgia, serif;
  --font-serif-jp: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  /* Body 17px / Table 15px / Line-height 1.9 (mandatory) */
  --fs-body: 17px;
  --fs-table: 15px;
  --fs-small: 14px;
  --fs-caption: 13px;
  --lh-body: 1.9;
  --lh-tight: 1.4;

  /* Spacing */
  --gutter-section: clamp(80px, 12vw, 160px);
  --gutter-element: 32px;

  /* Layout */
  --max-w-page: 1280px;
  --max-w-edit: 960px;
  --max-w-prose: 760px;
}

/* ----- 2. Reset & base ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  font-feature-settings: "tnum" 1, "lnum" 1, "palt" 1;
}

body {
  margin: 0;
  background: var(--paper-off-white);
  color: var(--ink-black);
  font-family: var(--font-sans-jp);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--ink-black);
  color: var(--paper-pure);
}

/* ----- 3. Document layout ----- */
.handbook-shell {
  max-width: var(--max-w-edit);
  margin: 0 auto;
  padding: clamp(48px, 6vw, 96px) clamp(24px, 4vw, 64px);
}

.handbook-header {
  border-bottom: 1px solid var(--rule-hairline);
  padding-bottom: 24px;
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.handbook-brand {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--ink-black);
  text-transform: uppercase;
}

.handbook-brand .slash {
  color: var(--accent-gold);
  font-weight: 900;
  margin: 0 2px;
}

.handbook-meta {
  font-family: var(--font-sans-en);
  font-size: var(--fs-caption);
  color: var(--ink-grey);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.handbook-footer {
  border-top: 1px solid var(--rule-hairline);
  padding-top: 24px;
  margin-top: 96px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-sans-en);
  font-size: var(--fs-caption);
  color: var(--ink-grey);
  letter-spacing: 0.08em;
}

/* ----- 4. Typography ----- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans-jp);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: var(--lh-tight);
  color: var(--ink-black);
}

h1 {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: clamp(36px, 4vw, 56px);
  letter-spacing: 0.04em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

/* Japanese chapter title under English h1 */
h1 + .chapter-jp,
.h1-jp {
  font-family: var(--font-sans-jp);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--ink-charcoal);
  margin-bottom: 48px;
}

h2 {
  font-size: 28px;
  margin: 80px 0 24px;
  padding-top: 24px;
  border-top: 1px solid var(--rule-hairline);
}

h3 {
  font-size: 22px;
  margin: 56px 0 16px;
}

h4 {
  font-size: 18px;
  margin: 32px 0 12px;
  text-transform: none;
}

h5 {
  font-size: 16px;
  margin: 24px 0 8px;
}

p {
  margin: 0 0 1.4em;
  max-width: var(--max-w-prose);
}

strong,
b {
  font-weight: 700;
  color: var(--ink-black);
}

em,
i {
  font-style: italic;
}

small {
  font-size: var(--fs-small);
  color: var(--ink-grey);
}

/* ----- 5. Lists ----- */
ul,
ol {
  margin: 0 0 1.4em;
  padding-left: 1.6em;
  max-width: var(--max-w-prose);
}

li {
  margin-bottom: 0.6em;
}

li::marker {
  color: var(--ink-grey);
}

/* Task list (checkbox) */
li input[type="checkbox"] {
  appearance: none;
  width: 14px;
  height: 14px;
  border: 1px solid var(--ink-graphite);
  background: var(--paper-pure);
  margin-right: 8px;
  position: relative;
  top: 2px;
}

li input[type="checkbox"]:checked {
  background: var(--ink-black);
  border-color: var(--ink-black);
}

li input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 2px;
  top: -1px;
  width: 4px;
  height: 8px;
  border: solid var(--paper-pure);
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

/* ----- 6. Tables ----- */
table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
  margin: 24px 0 32px;
  font-size: var(--fs-table);
  line-height: 1.7;
}

thead {
  border-bottom: 1px solid var(--ink-black);
}

thead th {
  text-align: left;
  font-weight: 700;
  padding: 12px 16px;
  letter-spacing: 0.04em;
  background: var(--paper-cream);
}

tbody tr {
  border-bottom: 1px solid var(--rule-hairline);
}

tbody tr:nth-child(even) {
  background: var(--paper-cream);
}

td,
th {
  padding: 10px 16px;
  vertical-align: top;
}

/* ----- 7. Code & pre ----- */
code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--paper-cream);
  padding: 2px 6px;
  border: 1px solid var(--rule-hairline);
  border-radius: 2px;
}

pre {
  background: var(--ink-black);
  color: var(--paper-off-white);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0;
  border: 1px solid var(--ink-black);
  overflow-x: auto;
  font-size: var(--fs-table);
  line-height: 1.6;
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
}

/* ----- 8. Blockquote ----- */
blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  border-left: 2px solid var(--accent-gold);
  background: var(--paper-cream);
  font-family: var(--font-serif-jp);
  font-size: var(--fs-body);
  color: var(--ink-charcoal);
  max-width: var(--max-w-prose);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ----- 9. Horizontal rule ----- */
hr {
  border: none;
  border-top: 1px solid var(--rule-hairline);
  margin: 64px 0;
}

/* ----- 10. Links ----- */
a {
  color: var(--ink-black);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 0.2s ease;
}

a:hover {
  border-bottom-color: var(--ink-black);
}

a:focus-visible {
  outline: 2px solid var(--ink-black);
  outline-offset: 2px;
  border-bottom-color: transparent;
}

/* ----- 11. Cover page ----- */
.cover {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 80px;
  page-break-after: always;
  background: var(--paper-off-white);
}

.cover-top {
  font-family: var(--font-sans-en);
  font-size: var(--fs-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-grey);
  border-top: 1px solid var(--ink-black);
  padding-top: 16px;
}

.cover-title {
  margin: auto 0;
}

.cover-title h1 {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: clamp(64px, 9vw, 128px);
  line-height: 0.9;
  letter-spacing: 0.04em;
  margin: 0;
}

.cover-title .slash {
  color: var(--accent-gold);
}

.cover-title .subtitle {
  font-family: var(--font-serif-jp);
  font-weight: 400;
  font-size: clamp(20px, 2.5vw, 32px);
  margin-top: 32px;
  letter-spacing: 0.06em;
  color: var(--ink-charcoal);
}

.cover-bottom {
  border-bottom: 1px solid var(--ink-black);
  padding-bottom: 16px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-sans-en);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  color: var(--ink-graphite);
}

/* ----- 12. Table of contents ----- */
.toc {
  page-break-after: always;
  padding-bottom: 80px;
}

.toc h2 {
  margin-top: 0;
  border-top: none;
}

.toc ol {
  list-style: none;
  padding-left: 0;
  counter-reset: toc-counter;
}

.toc ol li {
  counter-increment: toc-counter;
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--rule-hairline);
}

.toc ol li::before {
  content: counter(toc-counter, decimal-leading-zero);
  font-family: var(--font-sans-en);
  font-weight: 900;
  color: var(--ink-grey);
  letter-spacing: 0.06em;
  min-width: 32px;
}

.toc ol li a {
  flex: 1;
  border: none;
}

.toc ol li .page-num {
  font-family: var(--font-sans-en);
  color: var(--ink-grey);
  font-size: var(--fs-small);
}

/* ----- 13. Chapter divider (page break) ----- */
.chapter {
  page-break-before: always;
}

.chapter-divider {
  page-break-before: always;
  page-break-after: always;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 80px;
}

.chapter-divider .chapter-num {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: 96px;
  color: var(--accent-gold);
  line-height: 1;
  letter-spacing: 0.04em;
}

.chapter-divider .chapter-title-en {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: clamp(48px, 6vw, 88px);
  letter-spacing: 0.04em;
  margin-top: 24px;
  text-transform: uppercase;
}

.chapter-divider .chapter-title-jp {
  font-family: var(--font-serif-jp);
  font-weight: 700;
  font-size: 24px;
  margin-top: 16px;
  letter-spacing: 0.06em;
  color: var(--ink-charcoal);
}

/* ----- 14. Print optimizations ----- */
@page {
  size: A4;
  margin: 18mm 16mm 18mm 16mm;
}

@media print {
  body {
    background: var(--paper-pure);
    font-size: 11pt;
    line-height: 1.7;
  }

  h1 {
    font-size: 22pt;
  }
  h2 {
    font-size: 18pt;
    margin-top: 36px;
  }
  h3 {
    font-size: 14pt;
  }
  h4 {
    font-size: 12pt;
  }

  table {
    font-size: 10pt;
  }

  pre {
    font-size: 9pt;
    page-break-inside: avoid;
  }

  /* Hide URL after links in print (we keep them as listed in the doc body) */
  a::after {
    content: "" !important;
  }

  .handbook-shell {
    max-width: 100%;
    padding: 0;
  }

  h2,
  h3,
  h4 {
    page-break-after: avoid;
  }

  table,
  pre,
  blockquote {
    page-break-inside: avoid;
  }

  .chapter {
    page-break-before: always;
  }
}

/* ----- 15. Subtle texture (optional, web only) ----- */
@media screen {
  body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='100' height='100'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.2' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.025 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    z-index: 0;
  }

  .handbook-shell,
  .cover,
  .chapter-divider {
    position: relative;
    z-index: 1;
  }
}

/* ----- 16. Reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ----- 17. Page footer with page number (print only) ----- */
@media print {
  .page-number::after {
    content: counter(page);
  }
}

/* ==========================================================================
   18. Landing page (docs/index.html)
   ========================================================================== */

.landing {
  max-width: var(--max-w-page);
  margin: 0 auto;
  padding: 0 clamp(24px, 4vw, 48px);
}

.landing-hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(64px, 12vw, 160px) 0;
  border-bottom: 1px solid var(--rule-hairline);
}

.landing-hero__eyebrow {
  font-family: var(--font-sans-en);
  font-size: var(--fs-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-grey);
  margin-bottom: 24px;
}

.landing-hero__title {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: clamp(56px, 9vw, 144px);
  line-height: 0.92;
  letter-spacing: 0.02em;
  margin: 0 0 16px;
}

.landing-hero__title .slash {
  color: var(--accent-gold);
}

.landing-hero__subtitle {
  font-family: var(--font-serif-jp);
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 400;
  color: var(--ink-charcoal);
  margin-bottom: 56px;
  letter-spacing: 0.04em;
  max-width: 600px;
}

.landing-hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  font-family: var(--font-sans-jp);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid var(--ink-black);
  background: var(--ink-black);
  color: var(--paper-off-white);
  transition: background 0.2s, color 0.2s;
}

.btn:hover {
  background: var(--paper-off-white);
  color: var(--ink-black);
}

.btn--ghost {
  background: transparent;
  color: var(--ink-black);
}

.btn--ghost:hover {
  background: var(--ink-black);
  color: var(--paper-off-white);
}

.btn .arrow {
  font-family: var(--font-sans-en);
  font-weight: 400;
  transition: transform 0.2s;
}

.btn:hover .arrow {
  transform: translateX(4px);
}

.landing-section {
  padding: clamp(56px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--rule-hairline);
}

.landing-section:last-of-type {
  border-bottom: none;
}

.landing-section__label {
  font-family: var(--font-sans-en);
  font-size: var(--fs-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-grey);
  margin-bottom: 16px;
}

.landing-section__title {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 48px);
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

.landing-section__lead {
  font-family: var(--font-serif-jp);
  font-size: 18px;
  color: var(--ink-charcoal);
  max-width: 640px;
  margin-bottom: 48px;
}

.quickstart {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: 1px solid var(--ink-black);
  border-bottom: 1px solid var(--ink-black);
}

.quickstart__step {
  padding: 32px 24px;
  border-right: 1px solid var(--rule-hairline);
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  border-bottom: none;
  transition: background 0.2s;
}

.quickstart__step:last-child {
  border-right: none;
}

.quickstart__step:hover {
  background: var(--paper-cream);
}

.quickstart__num {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--accent-gold);
}

.quickstart__title {
  font-family: var(--font-sans-jp);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-black);
  letter-spacing: 0.02em;
}

.quickstart__desc {
  font-family: var(--font-sans-jp);
  font-size: 14px;
  color: var(--ink-graphite);
  line-height: 1.7;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.category-card {
  border: 1px solid var(--rule-hairline);
  padding: 32px;
  background: var(--paper-pure);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s;
}

.category-card:hover {
  border-color: var(--ink-black);
}

.category-card__index {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--accent-gold);
}

.category-card__title {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: 0.04em;
  margin: 0;
  color: var(--ink-black);
}

.category-card__title-jp {
  font-family: var(--font-sans-jp);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink-graphite);
  letter-spacing: 0.04em;
  margin-top: -8px;
}

.category-card__desc {
  font-family: var(--font-sans-jp);
  font-size: 14px;
  color: var(--ink-graphite);
  line-height: 1.7;
  margin: 0;
  max-width: none;
}

.category-card__list {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid var(--rule-hairline);
  padding-top: 16px;
}

.category-card__list li {
  margin: 0;
  padding: 0;
  font-size: 14px;
}

.category-card__list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  text-decoration: none;
  border: none;
  padding: 6px 0;
  color: var(--ink-charcoal);
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: color 0.2s, padding-left 0.2s;
}

.category-card__list a:hover {
  color: var(--ink-black);
  padding-left: 4px;
}

.category-card__list .num {
  font-family: var(--font-sans-en);
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

.category-card__more {
  font-family: var(--font-sans-en);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-graphite);
  text-decoration: none;
  border: none;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--rule-hairline);
}

.category-card__more:hover {
  color: var(--ink-black);
}

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  border-top: 1px solid var(--ink-black);
  padding-top: 32px;
}

.fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.fact__num {
  font-family: var(--font-sans-en);
  font-weight: 900;
  font-size: clamp(36px, 4vw, 64px);
  letter-spacing: 0.02em;
  line-height: 1;
}

.fact__label {
  font-family: var(--font-sans-jp);
  font-size: 13px;
  color: var(--ink-grey);
  letter-spacing: 0.04em;
}

.landing-footer {
  padding: 48px 0;
  border-top: 1px solid var(--ink-black);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-sans-en);
  font-size: var(--fs-caption);
  letter-spacing: 0.08em;
  color: var(--ink-grey);
  flex-wrap: wrap;
  gap: 16px;
}

.landing-footer .updated {
  text-transform: uppercase;
}

@media (max-width: 720px) {
  .landing-hero {
    min-height: 60vh;
  }

  .quickstart {
    grid-template-columns: 1fr;
  }

  .quickstart__step {
    border-right: none;
    border-bottom: 1px solid var(--rule-hairline);
  }

  .quickstart__step:last-child {
    border-bottom: none;
  }

  .category-card {
    padding: 24px;
  }
}